I want to do a disappearing act at the end of a performance I'm doing on July 4th. The desired effect of the trick is that I somehow disappear from the stage. What are the easiest/least expensive methods that I could feasibly do, without anything like trapdoors in the stage?

The stage is elevated off the ground a few feet, and it 's closed off from the sides. There are no curtains, or ways that I can escape the stage save for some obvious staircases on the sides.

Here is the most practical idea I've come up with: a cardboard gravestone, with a trick to it. The red ball represents me. Pardon my use of MS Paint.